A brass sample is to be analyzed for zinc. The sample is dissolved and the zinc is separated. The resulting 50.00 mL zinc solution has an absorbance of 0.751 in an atomic absorption analysis. An identical 50.00 mL sample of the zinc solution receives a 5.00 mL spike with a 6.73 g/mL zinc concentration. This second solution provided an absorbance of 0.909. What is the concentration of zinc in the original sample solution in g/mL? (Keep three significant figures in your result.)